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Two more AGU Session Announcements

Date: 08/24/2009

Dear SCEC Community,

Here are a few more forwarded announcements of sessions at this year’s AGU Fall Meeting in San Francisco, Dec. 14-18, 2009. The deadline for AGU abstract submission is September 3.

As a reminder, all past announcements of AGU session are reviewable upon sign-in to the SCEC CIS. Click on the "Announcements" icon to view them.

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S04: The Debate on to What Extent Static or Dynamic Stresses Triggers Earthquakes
Sponsor: Seismology, CoSponsor: Tectonophysics

Description: During the past decade a debate has been joined over whether aftershocks and subsequent mainshocks are triggered principally by static or dynamic stress. Arguments for static stress changes are principally founded on the spatial correlation of calculated Coulomb stress change with aftershocks or seismicity rate change; and on observations that fault creep and tidal Coulomb stresses, which have no dynamic component, have been shown to trigger and inhibit earthquakes. Strong evidence for dynamic earthquake triggering comes from preferred triggering in rupture propagation directions of large mainshocks, and a common decay of aftershock density from the near to far field. Which type of triggering is more important, especially in the near field, and how can we explain the time delay. We invite abstracts on all aspects of this debate, including tests of current hypotheses and proposals for other triggering mechanisms, such as reservoir loading, afterslip, pore fluids, or viscoelastic relaxations.

Conveners: Ross Stein (USGS), Keith Richards-Dinger (UCR), Zhigang Peng (GT), Nicholas van der Elst (UCSC), and Shinji Toda (Kyoto Univ.)

Invited Speakers: Jean Philippe Avouac (Caltech), David Hill (USGS), Kim Olsen (SDSU), and Tom Parsons (USGS).

http://www.agu.org/meetings/fm09/program/scientific_session_search.php?s...

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T08: Fault Processes in Nature and Lab: From Micro Scale to 3-D Regional Observations and Models

Faults are heterogeneous over time and space, and over a wide range of scales. Seismic and regional scale properties affect slip distribution and reservoir-to crustal scale mass and heat transfer; fault properties from the outcrop to the micro scale control processes such as rupture nucleation, fault permeability evolution, and fault healing and sealing. These aspects require an integrated analysis of structural and geochemical fault properties and fault evolution using a variety of methods that include geophysical surveys, outcrop and borehole-based studies, as well as laboratory and numerical simulations, all of which are invited here. This session aims at discussing (1) the long- and short-term behavior of fault systems at all scales, (2) timing of formation and reactivation of faults and their structural components, and (3) the impact of fault development and diagenetic reactions on fault and host rock permeability and strength.

Invited presentations: J. Urai, J. Cartwright, G. DiToro, A. Aydin

Conveners: C.M. Krawczyk, P. Eichhubl, S. Martel

http://www.agu.org/meetings/fm09/program/scientific_session_search.php?s...